Telegraph system



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Cu OC A Patented Nov. 23, 1948 TELEGRAPH SYSTEM Walter M.4 Bacon, New York, N. Y., assignor to Bell. Telephone Laboratories, Incorporated, New York, N. Y., a corporation ofNew York Application April 7, 1943, Serial No. 482,074

17 Claims.

This invention relates to telegraph systems and more particularly to yautomatic switching telegraph systems.y

An object of this invention is to provide an improved telegraph switching system capable of selectively and lmore expeditiously transmitting messages from one vstation to another station under control' of directing or address characters preceding 'the communications or messages to the various `stations in which a plurality of different classes of service are provided for different classes of messages or alternatively to diierent stations of the telegraphsystem.

This invention relates to automatic-telegraph systems wherein a plurality of outlying telegraph stations are connected to a central switching'station by means of party lines, that is, lines which entend `from -a plurality of outlyingstations to the central switching station. Equipment is provided at' the central station for' storing messages `received from the party line and later selectively transmitting the messages to the party line and thence to the proper station.

A typical telegraph system to which this invention is applicable is disclosed in -cop'ending application of Branson et al., Serial No. 448,878, filed June'27, 11942, Patent No. 2,430,447, dated Nov..1l, 1947, which application is hereby made a part of this application as if fully included herein.

In accordance with the present invention provision has been made for providing diiTerent classes cf service in such a system. In other words, provision has been made .to permit `one class or ,group :of messages to Vloe handled more expeditiously than another class or group of messages.

Alternatively, provision has been made to permit messages directed to any vpredetermined or group of predetermined stations of a party line to be handled more expeditiously than messages to other stations oi the same party line.

Systems of this type are particularly advantageous where the messages of one group are much longer or shorter than the messages of the other group. Under these circumstances, it will usually be desirable to provide more opportunities for transmission of the shorter messages because there will usually be more of them; Whenithe transmission is thusV controlled in Iaccordance with this invention, it may happen that ytile overall transmission of messages over the system is expedited,

In accordance with the present invention, :messages which it is desired to handle more expeditiously are preceded byv address codes different r from. the address codes preceding regular .messages or alternatively if it is desired to transmit regular messages and defer other messages, the address codes preceding the messages of the dif:- ferent classes `to the same station. or destination will be different. The switching equipment at the central switching station directs these messages in accordance with their address codesto repeating circuits associated with the party lines. One group oi repeating circuits is provided Vfor Aone group; or class of messages, while a second repeating circuit or group of repeating -circuitsis provided for another group of messages. As indicated above, these different `groups `of messages` may al1 be directed to any of the stations of the party line or they may be directed to certain specific stations or group oi' stations `of the party line.

Control circuits are provided vfor control-lingithe transmission of the messages over the party line to the 4respective stations served thereby. In accordance with the present invention a control circuit is arranged for scheduling or providing opportunities for transmission from the respective `groups of repeating or transmission devices associated with the party. line.

Inaccordance with the present invention each of the groups of difierent classes of service is provided wi-th more Ior less opportunities to trans mit or repeat messages over the associated party lines. By providing this-arrangement, instead .of providing absolute preference for one class of service, it is possible for a certain number of messages to be transmitted from the inferior mes-- sage group without waiting until al1 the messages of the other group have been transmitted. In other words, by providing the lpresent arrange-Y ment, toogreat a disparity is avoided between the two groups 4or classesof messages transmitted 4te.-` the system. Furthermore, it is. possible to easily control the degree of -diiierence between theI two services merely by changing a group of connections or crossconnections provided for that purpose..

It is. sometimesl desirable toprovide switching apparatus so that the degree of, difference be,- tween the two groups of messages or between the two services may be rapidly changed. For eX- ample, during certain hours of the day it may be. desirable to provide a large degree of difference between the messages as, for exam-ple, during the rush periods of the day and at other times to deal with all of the messages on a more nearly equal basis. Again, in case a party line extends to stations indifferent time zones,` during certain hours of the day it may be desirable to transmit messages to one station or to a group of stations more expeditiously than to a second station or group of stations while at other hours of the day it may be desirable to transmit all messages to both stations or both groups of stations with a minimum delay and at still other hours of the day it may be desirable to transmit messages to the second group of stations more expeditiously than to the first group of stations.

A further object of this invention is to provide switching apparatus for rapidly changing the relative frequency of transmission of messages from the different groups of messages when messages from all groups are awaiting transmission. Furthermore, in accordance with the present invention the maximum delay of the inferior message service is reduced and prevented from becoming excessive in case a large number of preferred messages are received.

The foregoing objects and features of the invention are not limited to two classes of message service, but may be applied to a greater plurality of classes of message service by merely providing a repeating device or a group of repeating devices for each Iclass of message or service for transmission over the respective party lines and providing more or less opportunities for transmission frorn the different groups, in accordance with the present invention.

The yforegoing objects and features of this invention, the novelty of which is specifically recited in the claims appended hereto, may be more readily understood from the following description when read with reference to the attached drawings in which:

Figs. 1A and 1B illustrate the manner in which the other figures of the drawing are arranged adjacent each other;

Figs. 2, 3 and 4 when positioned as shown in Fig. 1A, illustrate in outline form representative vcomponents of a typical automatic telegraph switching system in which a specific embodiment of this invention has been incorporated; and

Figs. 5 through 15, inclusive, when arranged as shown in Fig. 1B, show in greater detail one specic embodiment of the invention incorporated in a system shown in Figs. 2, 3 and 4, and which is similar to the system described in the aboveidentified copending application of Branson et al.

Referring now to Figs. 2, 3 and 4 when arranged as shown in Fig. 1A., Fig. 2 shows two typical party lines and the station and control equipment associated therewith. One party line is designated 210 which comprises a receiving channel 211 and a transmitting channel 212. Similarly, party line 260 comprises a receiving channel 261 and a transmitting channel 262. A typical trunk circuit 290 also comprising a transmitting channel and a receiving channel extends to a second switching center 295 similar to the switching center shown in Figs. 3 and 4 and described hereinafter.

Both transmitting and receiving channels are illustrated in Fig. 2 and also in Fig. 3 by means of telegraph lines or conductors. It is to be understood, however, that these lines. or channels may include any type of telegraph transmission equipment suitable f'or the transmission of telegraph signaling pulses or code com-binations of pulses. These lines or channels may, for example, include open wire lines, cable lines, ychannels of voice frequency or high frequency carrier current systems, radio systems, time division multiplex systems or telegraph channels Of composite telephone and -telegraph transmission systems, full duplex telegraph transmission systems, -or of any other type of pulse transmission channels or systems suitable for the transmission of signaling pulses such as employed in telegraph systems. The various party lines and channels thereof may include or comprise any or all of the foregoing types of transmission systems or any or all combinations 4of such types of transmission systems.

The transmission systems of the various types comprising the party lines operate in their usual and well understood manner and the operation, therefore, need not be included herein because it would serve no useful purpose and only tend to obscure the other elements and features of the present invention.

Each of the party lines shown in Fig. 2 extends to a plurality of outlying subscriber or way stations. Itis to be understood also that it is within the scope of this invention to extend lines individually from one or more of the outlying stations to the central switching exchange. In this case certain of the control equipment associated with each of the party lines need not be provided as will be readily apparent to those skilled in the art.

Each of the lines which extend to more than one youtlying station is provided with control equipment located at yor near the outlying stations of the lparty line. Control equipment may be provided Wh-ich is individual to each of the outlying or way stations in case the way stations are rather widely separated or -control equipment may be provided common to a group of outlying stations which are located more closely together. In addition, certain of the control equipment may be individual to certain outlying stations, while other control equipment provided for the same party line may be common to a plurality of the outlying stations.

As shown in Fig. 2, three separate and distinct sets of switching and controlling circuits, sometimes referred to as a secondary switching center, are associated with each of the party lines. For example, party line 2li! extends to the switching and control circuits or secondary switching centers 2l3, 2M and 2&5. The control equipment 2 I4 is individual to station 2 |19. Control equipment 215 is common to stations 2I6, 2H and 2 i8, while control equipment 213 is common to stations 220 to 224, inclusive. Each of the outlying stations is provided with a receiving instrument, transmitting apparatus, and control equipment. In the specific system described herein, the transmitting apparatus comprises a keyboard perforator for perforating paper tape in accordance with the signals to be transmitted and a tape controlled transmitter for transmitting signals in accordance with the perforations in the tape. For example, the receiving instrument and the keyboard perforator are illustrated diagrammatically and designated 225 at station 2 t6 of Fig. 2, the transmitting distributor is designated 235, while the control equipment is designated 236. Similar equipment is provided at the other stations. Station 2l9 is provided with an additional receiving recorder or reperforator for again perforating tape in accordance with messages received from the system. This reperforator is provided at those stations at which other telegraph lines or circuits may terminate so that the messages intended for stations connected to these other lines may be recorded at station 2|9 and later automatically audaci:

transmitted over the proper line without requiring the time oi an operator 'to retransmit the message.

In ord-er to transmit messages over this system, the attendant or subscriber at the loutlying or way stations perforates messages in paper tapes for later transmission over the system. Pre'ced-ing each message, an address er group of switching signals is perforated in the tape and following `each message an end of message signal is also perforated in the tape. Following the `end of message signal, a subscriber may perforate any address signal followed by another message intended for the station designated by the address. The subscriber, of course, may perforate any number 4of letters signals in the .tape at the beginning of the tape, at the end of the tape, or between messages. The subscriber may also perforate letters signals between various portions of the address or switching codes or between these signals and the message as described in greater detail in the above-'identified application of Branson et al. Furthermore, the operator ror attendant will usually -perforate an end of the transmission signal in the tape after the end rof message signal following the last message available for transmission.

'The -attendant or operator at the outlying station wi-ll then insert a tape in the transmitter for transmission over the system. At a later time the transmitter is started `under the control of anoperatoror under control of automatic switching circuits at the central switching station. Thereafter the messages are transmitted to the centralswitching station and recorded thereat.

The circuits at the central switching station are illustrated in Figs. 3 and 4. Fig. 4 shows the originating position at the central switching station comprising a keyboard perforator 4H, a monitoring receiving instrument 4H), transmitter or transmitting distributor M2, control relays M3 and a director circuit 414. Fig. 4 also shows a miscellaneous intercept circuit 42T which cooperates -with a receiving reperforator 426 and a tape receptacle 425. A wilful intercept circuit 424 is also shown. rIhis intercept circuit is provided with arepeating instrument 42@ comprising a recorder or reperforator 42! and a transmitting device 422. A director 423 is also associated with the wilful intercept circuit.

Each of the party lines terminating at the switching cnice is provided with an incoming line circuit 322 and a receiving only machine 323, a storage instrument 326 and associated transmitter 325. Incoming line circuit 322 causes the messages intended for the central switchingstation to be recorded on the receiving only receiver 323 and causes the messages intended for other stations of the system to be recorded by the reperforator 326. Director circuit 321 is associated with the transmitter 325 and serves to connect the transmitter 325 selectively to equipment associated ywithany of the lines terminating :at the central switching station under control of the address characters preceding each message.

Each Vof the party lines is also provided witha transmitter start circuit, such as 3H), and out- The outto stations of party line 21:0" are transmitted `to storage repeaters associated with line `210` .under control ofv address signal -or signals preceding the messa-ges `by the Vdirector' circuits of thelines upon which the messages originate for later transmission over the outgoing lines.

Figs. 2 and 3 also show a trunk 'circuit 290 comprising two transmission channels 29.1 and 292 extending to :a distant switching center .295. The terminal equipment associated with the trunk circuits is similar to the terminal equipmentl `associated with each of the party lines as described above. l i

'The operation of the various circuits referred, to above is described in detail in the aboveidentied rcopending patent application of Branson et al.

Since the respective circuits referred to abov forming parts of the system referred to lherein operate in substantially the same manner as described above in said patent application of Branson et al., which patent application has been made a part hereof as if fully included herein, the detailed description of the operation. of all of these rcircuits need not be repeated vat this point.

In addition, the apparatus located at the subscribers stations, at the secondary switching centers, and at the central switching station are of substantially the same types as shown and described in the above-identified application 'of Branson et al.

Reference will now be made .to Figs. 5 through 15, inclusive, when arranged as shown in Fig. 1B. Fig. `5 shows the subscribers stations and control equipmentassooiated with party line `2 lill. The subscribers stations and control equipment associated with' .party line 2 Il! are shown in substantially the same form as shown in Fig. 2. In addition, thesame reference numerals have been employed to designate lthe stations and equipment. Details of typical party lines of thistype are described in `the above ycopending application of Branson et al., and also in a patent application of Krecek et al., Serial No. 408,604,` led August 23, 1941, Patent No.2,366,733, dated Jan. 9, 1945, which applications are hereby made a part of this application as if fullyincluded herein. cuits at the subscribers stations as well as the control circuits therefor operate in substantially the same manner as described in the aboveidentined i copending applications, detailed description of the operation of the circuits will not be repeated here.

Fig. 5 lalso shows transmitter start circuit 3H) as well as the incoming line circuit 322, storage repeater 3324 comprising a reperforating unit 326 and a transmitting lunit '325. Fig. 5` also shows a receiving only machine 323 associated'with the incoming line circuit for receiving messages intended Yfor the central swtchingcenter. As described above, incoming messages intended for the central vswitching center are directed to the receiving only machine 323, while messages intended for other -stations of the system are recorded by'the receiving instrument 326 of 'thel storage instrument 324. The transmitting por'- tion of the storage device 324 cooperates with the director circuit l59| for selectively directing messages to the proper lines in accordance with the address codes preceding each of the messages'. Theoperation-oi the director circuit in directing Ymessages to the `respective `lines `of the system' 'under "control fof switching `or directing'charac- Inasmuch as the equipment in the cirters preceding various messages or communications is substantially the same as described in the above-identied application of Branson et al. Consequently, the details of operation of this portion of the system will not be repeated here. It should be noted, however, that a single line is shown in the drawing extending from the transmitter 325 to the director circuit |50l. This single line shown in the drawing is intended to represent the operative connections between transmitter 325 and director |ll| and includes as many wires or conductors as are necessary to control the operation of the system in the manner set forth in the above-identied copending Branson et al. application.

Assume now for purposes of illustra-tion that it is desired to expedite the transmission of messages directed to :the receiving recorder or reperf'orator 225i at station 2 I9. As indicated in the above-identied copending application of Branson et al., messages directed to fthe recording equipment 229 at sta-tion 2|9 are preceded by either the address code BJ or BK. Any suitable address code may be chosen to direct messages to this recording equipment, but for the purposes of illustration :the code letters BJ and BK were assumed in the aboVe-identiiied copending application and-will be likewise assumed herein. As pointed out in the above-identified copending application, -it is frequently desirable to retransmit messages recorded by the recorder 229 over other transmission systems. For this reason, it may be desirable to expedite the transmission yof these messages relative to other messages transmitted over the system described herein. The messages originating at any of the stations of party line 2 Ill or any of the other stations of the system directed to the recording equipment 229 will be transmitted to the central switching station in the same manner as the messages directed to other stations of the system. In transmitting these m-essages to the central switching station, the attendants at each 4of the outlying stations will perfora-te message signals preceded by the =address codes in the tape by means of the keyboard perforator `at the respective stations. The perfora-ted tape is then inserted in the tape controlled transmitter where it awaits transmission to the central switching station.

Equipment at fthe centr-a1 switching station either automatic or under control of the start keys 33t), causes the start circuit 3|ll to transmit predetermined start signals or patterns of signals over the receiving channel 2|| of party line 2li! and causes the initiation of transmission selec- .tively from the transmitters at the stations connected to the party line.

The messages are then transmitted over the transmitting channel such as 212 to the central switching station. The central station incoming line circuit together with Ithe storage repeater 32d. .and receiving only device 323 cause the signals to be recorded either by the receiving. only device 323 or by the storage repeater 324 by recording equipment 326 :thereof or by both of these devices. Thereafter the transmitting portion 325 of the storage repeater 324 will, in cooperation with the director circuit |50l, caus-e the message to be transmit-ted to circuits associated with the proper party line extending to the stations designated by the address preceding each message or communication.

The manner of operation loi? the equipment as well as more detailed description of the equipment aresetforth in the above-identied application of Branson et al. Since the equipment of the system described in this application operates in substantially the same manner as described in said application of Branson et al., the description thereof will not be again repeated.

In directing messages to the respective outgoing lin-e circuit, the director equipment |50| rst tests the outgoing line circuit equipment to determine whether or not it is busy. If the outgoing line equipment is busy, the director equipment will wait until it becomes idle. If the equipment is idle or some channel :thereof is idle, the director equipment will cause the message to be transmitted lover the idle channel.

Under the assumed condi-tion, messages Ipreceded by the address codes BJ and BK are transmitted more expeditiously than other messages, messages preceded by these address codes will be directed Ito the storage repeating equipment shown in Fig. 13, whereas, oth-er messages directed to other stations of the party line 2li! will be directed to the storage equipment shown in either Figs. 8 or 9.

Consider iirst the messages directed to the storage repeater equipment shown in Fig. 13. When messages `are preceded by the .address codes, either BJ or BK, director equipment will first test the conductor lili!) extending through the intercept circuit |v1l4| to determine whether or not the receving side of the storage repeater shown in Fig. 13 is busy. If this equipment is busy, nothing further will happen until the equipment becomes idle. At this time, the director circuit will cause ground `to be connected to lead |4|9 which lead extends `through the lower break contacts of relays Il, |fi|| and the upper break contacts of relay MM over conductor |4| 3 to 4the vertical magnet |5|2 of the cross bar switch diagrammatically illustrated in Fig. 15.

A typical switch is described in United States Paten-t 2,021,329, granted to Reynolds on November 19, 1935, which patent is hereby made a part :of this application as if fully included herein.

The horizontal magnet |553 of the cross bar switch was previously operated under control of the sequence circuit |502 and director circuit |5|J| in a mann-er similar to that described in the labove-dentiiied copending application of Branson et al. The operation of the vertical or hold magnet I5|2 when magnet |533 is also operated causes the contacts at :the cross-point to be 0D- erated and also completes a circuit over lead MI5 for operating relay |43| from battery through the winding of relay |43I, the lower break contacts of relay |4|4 and lead MI5 to ground through the operated contacts of magnet |5|2. Relay |43| in operating connects ground to lead |4|6 extending through the operated cross-point contacts of the cross lbar switch to the dire-ct-or circuit |5l. The director circuit then .completes a circuit for the operation of relay MM. Relay |4|4 in operating applies ground to lead |4|3 for holding magnet |5| 2 operated. Relay MM in operating also transfers the circuit of relay |43| to lead IMS extending to the director circuit. When the director circuit removes ground from lead MIS', relay 943| releases and prepares a circuit for the operation of relay mi2 from battery through the Winding of relay NH2, lower break contacts of relay |43l, over lead |4|6 to ythe director circuit. The director cir-cuit together with the release of relay 143| will cause relay |4| 2 to operate and condi-tion the receiving portion of the storage repeater shown in Fig. 13 for operation. In addition, the operation of relay |4|2 complet-es a circuit for the operation of relay I4|I. Relay |4|| iny turn operates yand completes a circuit for maintaining itself operated over lead |415. Relay |44 I in operating also. causes the circuit 'to test busy should any other director circuit ltest ythis circuit preparatory to sending -a message thereto.

The operation of relay I4I2 connects ground to lead |520 extending to the `director circuit which in turn causes the message preceded by the second of the address code to be transmitted to and recorded by the recording Vportion of the storage repeater shown in Fig. 13. Under the assumed conditions, the message will at this stage or transmission be preceded by either a J or K designating the recording equipment 229 at station 2|9.

In a similar manner, messages preceded by other of the address codes designating otherstations of the party line 2I0wi1l bed-irectedto either the storage repeater equipment shown in Fig. 8

or that shown in Fig. 9 in a manner similar to that 'described above with reference to the directing of a, message to the recording equipment shown, in Fig. 13.

In addition the messages directed to the other stations of party line .2|0 will be directed alter` The storage equipment shown in Figs. 8, 9, and y 13 comprises recording instruments YBlli, 90.6.. and

|306, respectively. These equipments are driven by their respective motors 80|, 9.0I and |'30| and record messages under control of therespective selector magnets 825, 9,25 and |325. and cause the` message to be both printed upon and perforated or punched in respective tapes 83.0, 93.0 and |330. When message material is stored by these receiving devices or storage devices, it will causethe respective transmitting heads 801, 9.01 and |301 to rotate in a counterclockwise directionv and thus cause the respective contacts 82|., 92| and I.32| to close.

Assuming now for purposes of illustration that message material has been supplied to each of the storage repeaters shown in Figs. 8, 9 and 13, and that this message material is transmitted to these repeaters .substantially simultaneously so that the contacts 82|, 92| and |32I are all closed substantially simultaneously. The closure of contacts 82| completes a circuit for 4the `operation of relay 1|0 from battery through the upper break contacts relay 1|5, the winding of relay 1|0, the second set of normal contacts from the top of relays 6I0 and 6I`9 to ground through the operated contact 82|. Likewise closure contact 92| com-,- pletes a circuit for the operation of relay 1|9 due to the current owing through a similar circuit to ground through the closedcontact 92 |"."It is assumed that relays 6|9, 6|() and GII are all normal or released at this time. In :other words, none of the stop keys associatedwith the transmitting portions of the storage repeaters shown in Figs. 8 and 9 have been operated and also that the transmitter start circuit 3|0 is not in the progress of transmitting a series of `start signals or patterns, or starting transmission from. any of the stations of the party-line. Y

If the transmitter start circuitis inthe progress of transmitting signals to cause the testing of any of the transmitters for storage message material available for transmission, relay ||9 will be operated, which relay interrupts the operating circuit of relays 1I0- and 1I8. These .relays will not, therefore, operate. at this time but will, wait until relay 109 is released at `the end of the titans,F misison of the transmitter start circuit by the transmitter start` circuit 3 I 0.

If either of the stop keys has beenoperated, either relay BID or 6I| will be operated and will prevent the operation of the corresponding relay 1|0 or '|I9. Assuming, however, that both relays 14.0 and 1|9 operate at this'time, the operation of relay 1If0. completes the circuit for the operation of relay `1|."i frombattery through the winding of relay 1 I3, through the lower inner break contacts of relay 6'01, the lower outer operated contacts of relay 1.|Il, to -ground through the second set of normal cont-acts from the bottom of relay 6.09 and the break contacts o relay 602.

The operation of relay 1I9 completesa similar circuit for the operation of relay 122 from battery through the winding of relay 122, the upper inner break contacts of relay 601, the lower outer operated contacts of relay 1|9, to groundthroug-h the third set of normal contacts from the top of relay 609 and the break contacts of relay 603. The operation of either or bothrelays 1|3 and 122 com,- pletes 'a circuit for the operationof relay 601 from battery through the winding of relay 601 to ground, through the upper outer loperated contacts of either or both relays 1I3 and 122. Relay 601 in operating interrupts the operating circuits of relays 1|3 and 1.22. However, the operation of relay 6,01 rst completes a circuit for maintaining relay '1|3 operated from battery through the winding and the upper operated contacts of relay 1 I3, the second set of operated contacts. from the top and bottom of relay |501` to ground through the break contacts of relay 60.2.

Inasmuch as both relays 1 I3 'and 122 have been operated, relay 113 will lock operated while relay 122 will release due to the fact that both its 0perating circuit and locking circuitare interrupted- The operating circuit of relay 12-2 is interrupted by the operation of relay 601 and its locking circuit is interrupted by the operation of relay 1|3.

The release of relay 122 completes the circuit for the operation of relay 606 which relay in operating prepares a. circuit for the operation of relay 6|2.

Similarly, the operation of`relay |204 `in response to the operation of contacts I32| prepares a circuit for the operation of relay |20I. Relays |20|` and SI2, however, do not both operate at this time.

The operation of relays 1|.0, 1|9 and |204 also connects ground to the right-hand winding terminal of re1ay.|2|4. With, however, `relays SI2, EIS, I20I and |202 released, the left-hand winding terminal of relay I2I4 will be open at contacts of these` relays.

Under these circumstances the terminal upon which the brush arm IZIIJ` of the steppingy switch is resting will determine which one of the relays I20| or 6|2 operates. As shown in Fig. l2 and with the brush arm |2|6 resting upon the rst terminal, relay |204 operated, a circuit will be completed for the operation of `relay |20I `extending from battery through brush arm |2I6,

the rst terminal of the associated bank, the Winding andthe upper inner break contacts of relay I20|, the lower break contacts of relay |202 to ground through the lower operated contacts of relay |204. The `operationof relay |20Icompletes a circuit for the operation of relay I 203 which relay is slow in operating, but after a short interval of time operates.

The operation of relay |203 completes a circuit for the operation of relay |2I4 from battery through the operated contacts of relay i203 and the winding of relay I2Il to ground through the lower inner operated contacts of relay |204. `Relay |2I4 in operating completes an obvious circuit for operating the stepping magnet |2|3 of `the selector switch. Brush arms I2I5 and IZIE,

however, do not operate upon the energization of magnet I2 I3. These brush arms instead advance upon the release of magnet |2|3 as will be described hereinafter. Relay I 2|4 and magnet I 2I3 remain energized as long as relays I and |204 remain operated.

The operation of relay 20| in addition completes an obvious circuit for the operation of relay |202. The operation of relay |202 interrupts the operating circuit of relay |20I. However, prior to the operation of relay |202, relay I20I completes a circuit for maintaining itself operated under control of relay |209 from ground through the lower operated contacts of relay |209, the upper inner operated contacts and winding of relay I20I to battery through the bank terminal and brush arm I2IB. The operation of relay I20I also removes a shunt or short circuit from around the cam controlled code contacts of the transmitting portion of the storage repeater shown in Fig. 13.

The operation of relay I 20| also completes a circuit for the operation of the release magnet |3|| from battery through the winding of magnet |3| I, the lower break contacts of relays |2|0 and |205, the second set of operated contacts from the top of relay I20I, the lower outer break contactsgof relay I2 I, right-hand break contacts yof relay |2I2 to ground through the closed contacts |32 I.

Magnet I 3|I in operating releases cam shaft |353 which controls the tape sensing equipment and transfer apparatus for sensing the codes stored in tape |330 and causing them to be transferred to members |309 which members in turn position the contacts controlling the circuits extending through the distributor contacts. During the revolution of the cam shaft |353, and after members |309 have been positioned in accordance with the code combination, contacts I 3'I6 close and complete an obvious circuit for the operation of the distributor start magnet |341. The operation of this magnet will release the distributor cam shaft |35I and cause a code combination to be transmitted over the receiving channel 2II and party line 2|0. Thereafter, the above cycle of operation of the transmitting portion of the storage repeater shown in Fig. 13 will be repeated and succeeding characters or code combinations stored in tape |330 will be transmitted over the` receiving channel 2|I of the party line 2I0.

Under the assumed conditions, the first code combination will be either the letter J or the letter K which will cause the switching equipment 2 I4 to direct a message to the reperforating equipment 229 at station 2 I9. It should be noted that messages directed to this equipment are transmitted even though other messages are awaiting for transmission to other stations or recording equipment on line 2I0 from the storage repeaters shown in Figs. 8 and 9.

Members |309 in addition to controlling contacts which cause the transmission of signals in 12 accordance with stored code combinations also control additional contacts which contacts com= plete circuits in response to the figures code combination and the letter H of the code combina-` tion. It will be obvious to those skilled in the art that these additional contacts may be arranged so that they may complete circuits in response to the setting of members |309 in accordance with any desired predetermined code combination. The code combinations representing figures and H employed herein by way of typical examples are suitable for controlling the respective circuits. The same code combinations were assumed by way of example in the above-identified application of Branson et al. It is, however, to be understood that any other suitable code combination may be employed.

Each time a figures code combination is transmitted over the receiving channel 2| I, a circuit is completed from ground through the contacts controlled by members |309 and over conductor |334 to battery through the upper winding of relay |208. Relay 208 operates due to current flowing through its upper winding in this circuit and prepares a circuit for the operation of relay |205. If the succeeding code combination is any code combinationl other than the code combination usually representing figures or the letter H, relay |208 will release when members |309 are positioned in accordance with this succeeding code combination. The release of relay |208 at this time will restore the circuits to their previous condition and the transmission of the signals stored in tape I 330 will continue.

As indicated above, at the end of the message vor communication, the subscriber will append to the message a disconnect or end of message signal or pattern which has been assumed by way of example to comprise a figures signal followed by an H signal and these two signals in turn followed by a letters signal or code combination.

When the figures signal is sensed by the transmitting head |301 and members |309 positioned in accordance with it, the above-described circuit for operating relay |208 will be completed and relay |208 operated as described above. The following signal under the assumed condition will then be the letter H signal. When the members |309 are positioned in acordance with the I-I signal following the figures signal, a circuit will be completed from ground through contacts controlled by members |309 over conductor |335, the lower operated contacts of relays I20| and |208 through the lower winding of relay |208 to battery and also through the upper operated contacts of relay |208 to battery through the vwinding of relay |205. Relay |208 is somewhat slow in releasing so t'hat it will remain operated during the transition between the setting of members |309 in accordance with the figures signal and the H signal. lWhen the members |309 are positioned in accordance with the H signal, the above-described circuits through the lower winding of relay |208 maintain this relay operated and in addition cause relay |205 to operate.

The operation of relay |205 completes a circuit for maintaining itself and relay |208 operated under control of relay I20| from battery through the lower winding and the upper operated contacts of relay |208, and also from battery through the winding and upper operated contacts of relay |205 to ground through the lower inner operated contacts of relay |20I. Both the figures code combination and the following H 

